Pneumatic Guide to Pipe Bursting - TT Technologies Inc.

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Soil Conditions and Types 1. Since most favorable bursting projects were originally installed by “trenching” or open cut, at least the top of the host pipe has fill material. Clay Sand 2. Is the surrounding soil expandable? Beach sand is an example of soil, with certain water conditions, that will not remain in the expanded state long enough for the installation of the new product pipe. A host pipe installed in a rock trench may not have room enough for soil expansion, especially if the new pipe is an upsize. Cobble Shale 3. Can the base soil support the weight of the tool, expander and product pipes? A sewer line which has been leaking for years may not support this weight during the bursting process. 4. Soil conditions may dictate the use of a lubricant, such as Bentonite or polymers, to help reach the burst length desired. Grundocrack rear expander design allows for efficient lubricant flow at the immediate rear of the expander. 5. Some backfill material, such as pea gravel, and very wet conditions will affect the success of a project. The knowledge of such conditions before the project is started is vital. Burst Length 1. In sewer rehab applications, burst length is usually manhole to manhole. GRUNDOWINCH 2. An intermediate manhole can be passed through with proper preparation. 10
3. Longer than normal bursts may need larger tools and Bentonite. Pipe Sizes 4. New pipe upsize will have an impact on burst length. Normal upsize is two pipe size increases, example: 8" to 10" or 8" to 12". Overly large increases in specified new pipe can result in project problems. In addition, the use of DIPS over IPS pipe can change the expected results, due to the increase in new pipe o.d. 0–25% Common Upsize Examples 25–50% Challenging 50–125% Experimental Product Pipe Sizes and Material 1. HDPE is the most common new pipe material. 2. Tool and expander selection is dictated by new pipe size, as well as host pipe specs. Table 1 3. Due to the weight of larger diameter, thicker wall HDPE, Bentonite is used to reduce friction. Examples of 100' lengths of various HDPE are shown in Table 1. 4. As shown in Table 1, a 600' length of 20" SDR 17 HDPE can approach 20,000 lbs. The GRUNDOCRACK tool and winch combination must overcome this weight, in addition to bursting the host pipe, and expanding the soil. 5. Pipe is available in IPS and DIPS sizes. The Product Guide is available on CD. GRUNDOCRACK pneumatic pipe bursting systems are featured on VHS videotape. Air Compressor 11
Page 1: A Guide to Pneumatic Pipe Bursting
Page 4 and 5: For over 35 years TT Technologies h
Page 6 and 7: Pipe bursting allows the replacemen
Page 8 and 9: Host Pipe Materials 1. Concrete, Re
Page 12 and 13: Peripheral Utilities 1. Start and e
Page 14 and 15: Tool and expander selection is affe
Page 16 and 17: Reduce or Eliminate Launch & Exit P
Page 18 and 19: 1 2 Reverse Removal with PCG Tools
Page 20 and 21: Bentonite Usage and Selection Bento
Page 22: GRUNDOWINCH Usage and Selection GRU

Pneumatic Guide to Pipe Bursting - TT Technologies Inc.

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